Complete polarization measurements for non‐symmetric Raman tensors: Symmetry assignments of ferrocytochrome C vibrations

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Abstract
The three invariants of the Raman tensors of eight strong Raman active vibrations of ferrocytochrome c have been determined using both linearly and circularly polarized light at 5145 Å. The relative intensities of the perpendicular, parallel, contrarotating and co‐rotating components have been measured and analysed by the method of McClain to obtain the symmetry assignment of each of these vibrations; the symmetry group of the heme is believed to be Cs showing a plane of reflection as the only symmetry element. Since the lowering of the symmetry of the heme group is due to hemeprotein interactions, Raman Polarization measurements appear to offer a new probe for obtaining the strength of such interaction.